trim-prefix.md

trim-prefix?

trim-prefix? checks whether a given string begins with another string and if it does, returns a copy of the string with the prefix removed. Note that this removal is done once, so removing the prefix "o" from "oof" will yield "of".

Examples

• (trim-prefix? "11234" "1") ➜ "1234"
• (trim-prefix? "11234" "x") ➜ "11234"

Forms

(trim-prefix? base:string prefix:string) ➜ string

• base is an arbitrary expression.
• prefix is an arbitrary expression.

trim-prefix? evaluates the first argument and coalesces it into a string. If successful, it evalates the prefix the same way. If both values are strings, the function checks if the base string has the prefix, and if so removes it once and returns the resulting string.

Context

trim-prefix? executes all expressions in their own contexts, so nothing is shared.